if (document.images) {

            img1on = new Image();      
            img1on.src = "images/n_home_.gif";
            img1off = new Image(); 
            img1off.src = "images/n_home.gif";
			
            img2on = new Image();      
            img2on.src = "images/n_paintings_.gif";
            img2off = new Image(); 
            img2off.src = "images/n_paintings.gif";
			
            img3on = new Image();      
            img3on.src = "images/n_exhibits_.gif";
            img3off = new Image(); 
            img3off.src = "images/n_exhibits.gif";
			
            img4on = new Image();      
            img4on.src = "images/n_biography_.gif";
            img4off = new Image(); 
            img4off.src = "images/n_biography.gif";
			
            img5on = new Image();      
            img5on.src = "images/n_email_.gif";
            img5off = new Image(); 
            img5off.src = "images/n_email.gif";

            img5Bon = new Image();      
            img5Bon.src = "images/n2_roses_.gif";
            img5Boff = new Image(); 
            img5Boff.src = "images/n2_roses.gif";

            img6on = new Image();      
            img6on.src = "images/n2_orchids_.gif";
            img6off = new Image(); 
            img6off.src = "images/n2_orchids.gif";
			
            img7on = new Image();      
            img7on.src = "images/n2_landscapes_.gif";
            img7off = new Image(); 
            img7off.src = "images/n2_landscapes.gif";
			
            img8on = new Image();      
            img8on.src = "images/n2_architecturals_.gif";
            img8off = new Image(); 
            img8off.src = "images/n2_architecturals.gif";
			
            img9on = new Image();      
            img9on.src = "images/n2_vineyards_.gif";
            img9off = new Image(); 
            img9off.src = "images/n2_vineyards.gif";
			
            img10on = new Image();      
            img10on.src = "images/n2_hummingbirds_.gif";
            img10off = new Image(); 
            img10off.src = "images/n2_hummingbirds.gif";
			
}

function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}